PCApplyBAorABTranspose#

Applies the transpose of the preconditioner and operator to a vector. That is, applies tr(B) * tr(A) with left preconditioning, NOT tr(B*A) = tr(A)*tr(B).

Synopsis#

#include "petscksp.h" 
PetscErrorCode PCApplyBAorABTranspose(PC pc, PCSide side, Vec x, Vec y, Vec work)

Collective

Input Parameters#

  • pc - the preconditioner context

  • side - indicates the preconditioner side, one of PC_LEFT, PC_RIGHT, or PC_SYMMETRIC

  • x - input vector

  • work - work vector

Output Parameter#

  • y - output vector

Note#

This routine is used internally so that the same Krylov code can be used to solve A x = b and A’ x = b, with a preconditioner defined by B’. This is why this has the funny form that it computes tr(B) * tr(A)

See Also#

PC, PCApply(), PCApplyTranspose(), PCApplyBAorAB()

Level#

developer

Location#

src/ksp/pc/interface/precon.c

Edit on GitLab

Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages